Monkey wrench



Feb. 16 1926. 1,573,722

H. A. LOGAN MONKEY WRENCH Filed. May 28, 9

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nimation nee To all whom it may concern:

\Vrenches, of which the following is a specification, reference beinghad to the accompanying drawings.

This invention relates tofwrenches, and

particularly to monkey wrenches.'

The general object of the invention is to 1 provide a wrench of thischaracter in which the jaws automatically close upon the nut or otherwork as the wrench is turned to turn the work, and in this connection toprovide a wrench wherein one of the jaws is adjustable to adapt thewrench to different sizes of work. v I

A further object is to provide a construction of this character whereinthe principle of the toggle is used for the purpose of cansing theclosing of the jaws, thus causing 'the jaws to close with-great strengthupon the work.

Other objects will appear in the course of the following description.

My invention is illustrated in the accompany drawing, wherein 'Figure 1is a side elevation of a monkey wrench constructed in accordance with myinvention showing the jaws open;

Fig. 2 is alike view'to Fig. 1 but showing the jaws closed upon thework;

Fig. 3 is a front elevation of the construc-. tion shown in Fig. 1; and

Fig. 4 is a fragmentary rear elevation of thehandle 10.

Referring to the drawing, designates the handle of the wrench which isformed with an offset 11 at its upper end. Above the offset 11 one sideof the wrench is cut away, as at 12, to form a recess and the lower wallof this recess is vertically slotted, as at-13. I Q

Pivotally mounted withinthis recess is a-toggle link 15 having a ton inginto the slot 13 and plvoted to the handle by means of the pivot 16. Theoffset portion 11 is formed with a transversely' extending slot 17 andthehandle upon 1ts inside face is formed with a longitudinally extendingrecess 18 opening mto this slot 17 and opening upon the face of e 14extend- I ay as, 1925. Serial No. aa,sa4. I the handle." A bore 19extends from the slot 17 longitudinally through the handle.

Operatingwithin this-bore is-the screwthreaded rod 20' and a nut 21 isdisposed within the slot 17 engaging this screw so that when the nut isturned the rod will be raised or lowered. The u per end of the rod isformed with a bi urcated head 22, and pivotally connected at 22" to thishead is a'shank 23 having a tongue extending into the bifurcation of thehead. This shank 23 passes loosely through a sliding jaw 24 and the jaw24. vT e confronting faces of the jaws 24 and 25 are serrated, toothedor otherwise formed. One face of the sliding jaw 24 has a downwardlyextending tongue 26 which engages ,inthe bifurcated upper end of thelink 15 and is pivoted thereto. by a pivot pin 27.

In the operation of this device, the nut 21 is turned so as to shift therod 20 longitudinally in one direction or the other.

When the rod is shifted toward the jaw- 24, the jaw25 will be carriedaway from the jaw 24 so as to increase what may be termed the normalspace between the jaws; and a reverse movement of the nut will reversethe movement of the jaws and draw the upper jaw nearer to the jaw 24.When the jaws have been brought. into approximate dposition to grasp anut, the jaws. are place upon the nut or other work and the carries atits upper end a aw 25 confronting I handle turned toward the left inFig. 2.

This acts to swing the handle with reference to the link 15 and withreference to the shank 23, the shank 23 pivoting on the pivot in 22.This acts to shorten the distance tween the jaw 25 and the sliding jaw I24 and the turning of the handle causes it to have an angular relationto the link 15 and shank 23, as illustrated in Fig. 2. Thus the two jawsare caused to relatively move I v toward each other and jam upon thenut. A reverse movement of the handle will act to open the jaws untilthe link 15 comes in;

contact with the flat face 11 of the recess within which the link ispivoted. This flat face then acts to stop the movement of the linktowardthe handle beyond a position where the link 15 is parallel to thelongitiudinal axis of the .handle, as shown in While I have illustratedcertain details of construction and arrangement of parts which I believeto be particularly effective, I do not wish to be limited thereto, as itis obvious that many changes might be made in the smaller detailswithout departing from the spirit of the invention. The wrench'may bemade of any suitable material, but preferably the handle will be facedwith wood.

It will be understood that this wrench is designed to be used as a pipeWrench as well as a nut wrench or used for any purpose for which it isadapted. The particular advantage of the device resides in thesimplicity of the "wrench and the power with which the movable jaw isforced toward the fixed jaw by the toggle link when the wrench is put inoperation.

I claim 1. A wrench of the character described comprising a handle, ascrew-threaded rod having longitudinal movement within the handle, a nutengaging the rod and the handle whereby the rod may be shifted longitudinally relative to the handle, a jaw shank pivotally connected tothe rod and carrying a jaw at its outer end, a sliding jaw mounted uponthe shank and shiftablc longitudinally thereon, a link pivotallyconnected to the handle and tothe slidingjaw whereby when the jaws graspan object and the handle is shifted in one direction the handle and jawshank will take an angular jaw mounted upon the shank, and a linkpivotally connected to the handle and normally extending parallel to theshank, the sliding jaw having a tongue pivotally connected to the link.

3. A wrench of the character described comprising a handle having alongitudinally extending bore and a transverse slot, a screw-threadedrod mounted in the bore and longitudinally movable therein, a nutdisposed in said slot and engaging the screwthreaded rod, a jaw shankpivotallv connected to one extremity of the screw-threaded rod andhaving a jaw at its opposite end, a. sliding jaw mounted upon the shank,and a link pivotally connected to the handle and normally extendingparallel to the shank, the sliding jaw having a tongue pivotallyconnected to the link, the handle at its end nearest the jaws beingrecessed to receive the adjacent end of the link.

In testimony whereof I hereunto aflix my signature.

HENRY A. LOGAN.

